Core Web Vitals
Core Web Vitals are Google's three measurements of how a page feels to load: how fast the main content appears, how quickly the page responds to interaction, and how much the layout jumps around while loading. They're measured from real visitors' browsers.
Why it matters
Slow, janky pages lose people before the content gets a chance, especially on phones, especially on paid traffic you're buying by the click. Google also folds these scores into ranking, so performance debt quietly taxes both conversion and visibility.
How it works
Chrome reports real-user timings back to Google: LCP (largest content painted), INP (interaction responsiveness) and CLS (layout shift). Scores are judged per-page against fixed thresholds, and the usual culprits are oversized images, third-party scripts, and fonts loaded carelessly.
What to do about it
Run PageSpeed Insights on your five most-visited pages and read the "field data" section: that's real visitors, not a lab. Fix the biggest culprit first; it's usually images, and it's usually a day's work for a visible difference.
